On the stages in the development of Syntomosphyrum albiclavus Kerrich (Hym., Eulophidae), a parasite of tsetse flies

Abstract

The life-cycle and immature stages of the Eulophid, Syntomosphyrum albiclavus Kerrich, a pupal parasite of tsetse flies (Glossina), are described. Measurements of the widths of the cephalic skeletons of larvae of all ages fell into four well separated groups, and confirmation that these represented the existence of four larval instars was given by Dyar's law, the application of which in this instance is not invalidated by the disproportionate length of the fourth instar or the effects of overcrowding, which do not become apparent before that stage.